Finding the Fourth Proportional to 138,641.82, 191,327.57 and 78,212.28

Step by Step Solution

1. Step 1: Write the proportion equation
   138,641.82 : 191,327.57 = 78,212.28 : x
2. Step 2: Convert to fraction form
   138,641.82/191,327.57 = 78,212.28/x
3. Step 3: Cross multiply
   138,641.82x = 191,327.57 × 78,212.28
4. Step 4: Simplify right side
   138,641.82x = 14,964,165,476.56
5. Step 5: Solve for x
   x = 14,964,165,476.56/138,641.82
6. Step 6: Final answer
   x = 107,933.99